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| author | Michael Niedermayer <michaelni@gmx.at> | 2007-03-21 22:02:52 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2007-03-21 22:02:52 +0000 |
| commit | 66a148a19ae6c6284afeaf7a14dea6ba49069a9a (patch) | |
| tree | d9f814143141bc973d11da50d5c0b51098bba630 | |
| parent | 8076609a40ebf19541b52fe47a882c5ddd0fcb7c (diff) | |
| download | ffmpeg-66a148a19ae6c6284afeaf7a14dea6ba49069a9a.tar.gz | |
remove dithering of filter coefficients, improves precision by 1-2 bits and
improves subjective sound quality on artificial sample (udial.wav resampling
to 32khz)
Originally committed as revision 8467 to svn://svn.ffmpeg.org/ffmpeg/trunk
| -rw-r--r-- | libavcodec/resample2.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/libavcodec/resample2.c b/libavcodec/resample2.c index 9cc2edbe8f..82eddf6562 100644 --- a/libavcodec/resample2.c +++ b/libavcodec/resample2.c @@ -93,7 +93,6 @@ void av_build_filter(FELEM *filter, double factor, int tap_count, int phase_coun for(ph=0;ph<phase_count;ph++) { double norm = 0; - double e= 0; for(i=0;i<tap_count;i++) { x = M_PI * ((double)(i - center) - (double)ph / phase_count) * factor; if (x == 0) y = 1.0; @@ -121,9 +120,8 @@ void av_build_filter(FELEM *filter, double factor, int tap_count, int phase_coun /* normalize so that an uniform color remains the same */ for(i=0;i<tap_count;i++) { - v = av_clip(lrintf(tab[i] * scale / norm + e), FELEM_MIN, FELEM_MAX); + v = av_clip(lrintf(tab[i] * scale / norm), FELEM_MIN, FELEM_MAX); filter[ph * tap_count + i] = v; - e += tab[i] * scale / norm - v; } } } |